This is a library to aid in instrumenting Node.js libraries at build or load time.

Match different multiaddr formats

Shared Claude Code / Codex hook wire protocol: matcher engine, stdin/exit-code/stdout codec, multi-hook merge, and hook/* session events

Fast CIDR matcher. Given an input IPv4 address, it checks if it's inside a set of IP ranges, expressed in CIDR notation.

Jest matcher for image comparisons. Most commonly used for visual regression testing.

Extend jest to assert arrays with approximate values

Matches strings against configurable strings, globs, regular expressions, and/or functions

Properly hijack require, i.e., properly define require hooks and customizations

Implements CLDR enhanced language matching

HaveIBeenPwned Matcher for zxcvbn-ts

Unicode-aware Aho–Corasick multi-pattern matching with UTF-16 ranges, counting, lazy iteration, and replacement.

(temporary fork of picomatch) Blazing fast and accurate glob matcher written in JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions.

TypeScript definitions for split2

ignorefile/includefile matching .gitignore spec

Node.js globbing for amqp-like topics

Diffing Jest snapshots utility

TypeScript definitions for cidr-matcher

Jest utilities for Styled Components

Jest matcher to validate xml equality

Make sure your function really throws what you expect